The composition of pumice sulfate is calcium, magnesium and other substances. Pumice sulfate is used instead of lime in substrate media. It may increase growth of mushroom mycelia and effect on yield. Because adding 1% of pumice sulfate in agar for Boletus spp. could increase growth of mycelia 20-30%. (Deeprong,2543) And adding 1% of pumice sulfate induced inereasing growth rate and mycelia density of Pleurotus and Coprinue too.(Akekarate,2550) Furthermore, pumice sulfate could reduce damage from mite in bag cultivation, the glass stone in pumice sulfate create a wound and death of mite.